手动在谷歌地图上拖放图钉并相应地获取经度和纬度

Question

在 Google 地图中，我在用户的当前位置放置了一个图钉，但现在我想为用户提供另一个功能，即他可以手动拖动该图钉并将其放到地图上的任何位置，同时在他手动放置图钉时我可以收到一个回调，它会告诉我用户放下该别针的那个位置的经度和纬度。

如果你能给我一些例子，那将是非常可观的。

Answer 1

在过去的几天里，我终于找到了如何实现你描述的那些功能，因为这个问题没有答案，我决定发布我发现的东西，即使你问了很长时间，你可能会发现自己另作回答。

所以，我使用了thisgit 的代码。除了我没有以这种方式尝试的回调之外，我设法做了所有你想做的事情。按下按钮后，我得到了大头针的位置。

---

没有必要发布我的AndroidManifest，因为我读到您在显示您的位置时没有问题，因此所需的权限很好。

---

唯一需要做的就是创建一个名为MapsActivity 的活动。 这是它的全部内容：

import com.google.android.gms.maps.*;
import com.google.android.gms.maps.model.*;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;
import android.widget.Toast;

import common.logger.Log;

public class MapsActivity extends Activity implements
        OnMapReadyCallback, GoogleMap.OnInfoWindowClickListener,
        GoogleMap.OnMarkerDragListener {

    LatLng position = new LatLng(34.6767, 33.04455);
    final Marker marker_final = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);

        MapFragment mapFragment = (MapFragment) getFragmentManager()
                .findFragmentById(R.id.
                        map);
        mapFragment.getMapAsync(this);

        ImageButton returnback = (ImageButton)findViewById(R.id.returnback);
        returnback.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                    Toast.makeText(MapsActivity.this.getApplicationContext(), position.latitude + ":"  + position.longitude, Toast.LENGTH_LONG).show();
            }
        });


    }

    @Override
    public void onMapReady(GoogleMap map) {


        map.setMyLocationEnabled(true);
        map.moveCamera(CameraUpdateFactory.newLatLngZoom(position, 13));
        CameraUpdate zoom = CameraUpdateFactory.zoomTo(15);
        map.animateCamera(zoom);

        map.addMarker(new MarkerOptions()
                .title("Shop")
                .snippet("Is this the right location?")
                .position(position))
                .setDraggable(true);

       // map.setInfoWindowAdapter(new PopupAdapter(getLayoutInflater()));
        map.setOnInfoWindowClickListener(this);
        map.setOnMarkerDragListener(this);
    }

    @Override
    public void onInfoWindowClick(Marker marker) {
        Toast.makeText(this, marker.getTitle(), Toast.LENGTH_LONG).show();
    }

    @Override
    public void onMarkerDragStart(Marker marker) {
        LatLng position0 = marker.getPosition();

        Log.d(getClass().getSimpleName(), String.format("Drag from %f:%f",
                position0.latitude,
                position0.longitude));
    }

    @Override
    public void onMarkerDrag(Marker marker) {
        LatLng position0 = marker.getPosition();

        Log.d(getClass().getSimpleName(),
                String.format("Dragging to %f:%f", position0.latitude,
                        position0.longitude));

    }

    @Override
    public void onMarkerDragEnd(Marker marker) {
        position = marker.getPosition();

        Log.d(getClass().getSimpleName(), String.format("Dragged to %f:%f",
                position.latitude,
                position.longitude));
    }
}

---

这是我的activity_maps.xml 布局（我还添加了一个编辑文本，但没有必要使用它）：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:descendantFocusability="beforeDescendants"
    android:focusableInTouchMode="true"
    android:background="#ecf0f1">

    <ScrollView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@+id/scrollView3" >

        <LinearLayout
            android:orientation="vertical"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent">

            <LinearLayout
                android:orientation="horizontal"
                android:layout_width="fill_parent"
                android:weightSum="1"
                android:layout_height="wrap_content">

                <EditText
                    android:layout_width="fill_parent"
                    android:layout_height="wrap_content"
                    android:layout_weight="0.9"
                    android:id="@+id/locationsearch" />

                <ImageButton
                    android:layout_width="40dp"
                    android:layout_height="40dp"
                    android:id="@+id/search"
                    android:layout_weight="0.1"
                    android:background="@drawable/search" />

            </LinearLayout>

            <fragment xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/map"
            android:layout_width="match_parent"
            android:layout_height="405dp"
            android:name="com.google.android.gms.maps.MapFragment"/>

            <ImageButton
                android:layout_width="60dp"
                android:layout_height="60dp"
                android:id="@+id/returnback"
                android:background="@drawable/less" />
        </LinearLayout>
    </ScrollView>

</LinearLayout>

Answer 2

请参阅下面的链接，您可以在其中找到来自 Commons guy 的示例

Sample

SO question

Answer 3

嗨使用下面的代码。

您将获得丢弃的引脚位置。

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;



import com.google.android.maps.GeoPoint;
import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.MyLocationOverlay;
import com.google.android.maps.OverlayItem;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;

import android.graphics.Canvas;
import android.graphics.Point;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.location.Address;
import android.location.Criteria;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;

import android.os.AsyncTask;
import android.os.Bundle;

import android.view.MotionEvent;
import android.view.View;

import android.widget.ImageView;

import android.widget.RelativeLayout;

import android.widget.Toast;


public class rescue extends MapActivity {


    private LocationManager myLocationManager;
    private LocationListener myLocationListener;

    private MapView myMapView;
    private MapController myMapController;
    private String provider;
    private MyLocationOverlay me=null;


    private int defaultLat =(int)(51.51216124955517); 
    private int defaultLong =(int)(-0.1373291015625);

    private GeoPoint defaultGeoPint = new GeoPoint(defaultLat,defaultLong);






    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.rescue);

        setCurrentLocation();

    }


    @Override
    protected boolean isRouteDisplayed() {
        // TODO Auto-generated method stub
        return false;
    }











    private void setCurrentLocation()
    {
      myMapView = (MapView)findViewById(R.id.rescueMapView);
      myMapView.setTraffic(true);
      ///myMapView.setBuiltInZoomControls(true);

      myMapController = myMapView.getController();
      myMapController.setZoom(16); //Fixed Zoom Level


      myLocationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
      myLocationListener = new MyLocationListener();

      try
      {
      Criteria criteria = new Criteria();
      provider = myLocationManager.getBestProvider(criteria, false);

      Location location = myLocationManager.getLastKnownLocation(provider);

      myLocationManager.requestLocationUpdates(
              provider,
        0,
        0,
        myLocationListener);

      Location lastLocation = myLocationManager.getLastKnownLocation(provider); 

          if(lastLocation != null)
          {
              int lastLocLat =(int)(lastLocation.getLatitude()*1000000); 
              int lastLocLong =(int)(lastLocation.getLongitude()*1000000);
              //Get the current location in start-up
              GeoPoint initGeoPoint = new GeoPoint(lastLocLat,lastLocLong);
              CenterLocatio(initGeoPoint);
          }
          else
          {
              AlertDialog.Builder builder = new AlertDialog.Builder(this);
              builder.setTitle("Location Services Disabled")
                     .setMessage("The location service on the device are disabled, your location is not able to be found, please call AXA uding the button below to be rescued")
                     .setCancelable(false)
                     .setPositiveButton("Drop pin", new DialogInterface.OnClickListener() {
                         public void onClick(DialogInterface dialog, int id) {
                              //do things
                             CenterLocatio(defaultGeoPint);
                         }
                     });
              builder.create().show();


          }
      }
      catch (Exception e) 
      {
        // TODO: handle exception


            Context context = getApplicationContext();
            String toasttext = e.getMessage();
            int duration = Toast.LENGTH_SHORT;

            Toast toast = Toast.makeText(context, toasttext, duration);
            toast.show();


      }






    }

    private void CenterLocatio(GeoPoint centerGeoPoint)
     {
        myMapView.getOverlays().clear();
      myMapController.animateTo(centerGeoPoint);



      Drawable marker=getResources().getDrawable(R.drawable.marker);

        marker.setBounds(0, 0, marker.getIntrinsicWidth(),
                                marker.getIntrinsicHeight());

        int lat = centerGeoPoint.getLatitudeE6();
        int lon = centerGeoPoint.getLongitudeE6();

        double lat1 = centerGeoPoint.getLatitudeE6()/1E6;

        double lon1 = centerGeoPoint.getLongitudeE6()/1E6;

        ArrayList<Double> passing = new ArrayList<Double>();
        passing.add(lat1);
        passing.add(lon1);

        Context context = getApplicationContext(); 
        ReverseGeocodeLookupTask task = new ReverseGeocodeLookupTask();
        task.applicationContext = context;
        task.activityContext = rescue.this; 
        task.execute(passing);

        myMapView.getOverlays().add(new SitesOverlay(marker,lat, lon ));

        me=new MyLocationOverlay(this, myMapView);
        myMapView.getOverlays().add(me);

     };

     private class MyLocationListener implements LocationListener{

         @Override
          public void onLocationChanged(Location argLocation) {
           // TODO Auto-generated method stub
           GeoPoint myGeoPoint = new GeoPoint(
            (int)(argLocation.getLatitude()*1000000),
            (int)(argLocation.getLongitude()*1000000));

           //CenterLocatio(myGeoPoint);
          }

          public void onProviderDisabled(String provider) {
           // TODO Auto-generated method stub
          }

          public void onProviderEnabled(String provider) {
           // TODO Auto-generated method stub
          }

          public void onStatusChanged(String provider,
            int status, Bundle extras) {
           // TODO Auto-generated method stub
          }



         }


     private GeoPoint getPoint(int lat, int lon) {

         return(new GeoPoint(lat, lon));

         /*
            return(new GeoPoint((int)(lat*1000000.0),
                                  (int)(lon*1000000.0)));
                               */
          }


      private class SitesOverlay extends ItemizedOverlay<OverlayItem> {
            private List<OverlayItem> items=new ArrayList<OverlayItem>();
            private Drawable marker=null;
            private OverlayItem inDrag=null;
            private ImageView dragImage=null;
            private int xDragImageOffset=0;
            private int yDragImageOffset=0;
            private int xDragTouchOffset=0;
            private int yDragTouchOffset=0;

            public SitesOverlay(Drawable marker, int lat, int longitude) {
              super(marker);
              this.marker=marker;

              dragImage=(ImageView)findViewById(R.id.drag);
              xDragImageOffset=dragImage.getDrawable().getIntrinsicWidth()/2;
              yDragImageOffset=dragImage.getDrawable().getIntrinsicHeight();

              items.add(new OverlayItem(getPoint(lat,
                                                  longitude),
                                        "UN", "United Nations"));

              /*
              items.add(new OverlayItem(getPoint(40.76866299974387,
                                                  -73.98268461227417),
                                        "Lincoln Center",
                                        "Home of Jazz at Lincoln Center"));
               */
              populate();
            }

            @Override
            protected OverlayItem createItem(int i) {
              return(items.get(i));
            }

            @Override
            public void draw(Canvas canvas, MapView mapView,
                              boolean shadow) {
              super.draw(canvas, mapView, shadow);

              boundCenterBottom(marker);
            }

            @Override
            public int size() {
              return(items.size());
            }

            @Override
            public boolean onTouchEvent(MotionEvent event, MapView mapView) {
              final int action=event.getAction();
              final int x=(int)event.getX();
              final int y=(int)event.getY();
              boolean result=false;

              if (action==MotionEvent.ACTION_DOWN) {
                for (OverlayItem item : items) {
                  Point p=new Point(0,0);

                  myMapView.getProjection().toPixels(item.getPoint(), p);

                  if (hitTest(item, marker, x-p.x, y-p.y)) {
                    result=true;
                    inDrag=item;
                    items.remove(inDrag);
                    populate();

                    xDragTouchOffset=0;
                    yDragTouchOffset=0;

                    setDragImagePosition(p.x, p.y);
                    dragImage.setVisibility(View.VISIBLE);

                    xDragTouchOffset=x-p.x;
                    yDragTouchOffset=y-p.y;

                    break;
                  }
                }
              }
              else if (action==MotionEvent.ACTION_MOVE && inDrag!=null) {
                setDragImagePosition(x, y);
                result=true;
              }
              else if (action==MotionEvent.ACTION_UP && inDrag!=null) {
                dragImage.setVisibility(View.GONE);

                GeoPoint pt=myMapView.getProjection().fromPixels(x-xDragTouchOffset,
                                                           y-yDragTouchOffset);


                String title = inDrag.getTitle();
                OverlayItem toDrop=new OverlayItem(pt, title,
                                                   inDrag.getSnippet());



                items.add(toDrop);
                populate();










                double lat = pt.getLatitudeE6()/1E6;

                double lon = pt.getLongitudeE6()/1E6;

                ArrayList<Double> passing = new ArrayList<Double>();
                passing.add(lat);
                passing.add(lon);

                Context context = getApplicationContext(); 
                ReverseGeocodeLookupTask task = new ReverseGeocodeLookupTask();
                task.applicationContext = context;
                task.activityContext = rescue.this; 
                task.execute(passing);

                //CenterLocatio(pt);



                inDrag=null;
                result=true;
              }

              return(result || super.onTouchEvent(event, mapView));
            }

            private void setDragImagePosition(int x, int y) {
              RelativeLayout.LayoutParams lp=
                (RelativeLayout.LayoutParams)dragImage.getLayoutParams();

              lp.setMargins(x-xDragImageOffset-xDragTouchOffset,
                              y-yDragImageOffset-yDragTouchOffset, 0, 0);
              dragImage.setLayoutParams(lp);
            }
          }

      public class ReverseGeocodeLookupTask extends AsyncTask <ArrayList<Double>, Void, String>
        {
            private ProgressDialog dialog;
            protected Context applicationContext;
            protected Context activityContext;

            @Override
            protected void onPreExecute()
            {
                this.dialog = ProgressDialog.show(activityContext, "Please wait", 
                        "Requesting location", true);
            }


            protected String doInBackground(ArrayList<Double>... params) 
            {


                String foundAddress = "";
                String localityName = "";
                ArrayList<Double> passed = params[0];
                double lat = passed.get(0);
                double lon = passed.get(1);
                try
                {

                List<Address> addresses = new Geocoder(applicationContext,Locale.getDefault()).getFromLocation(lat,lon, 1);
                if (addresses.size() > 0)
                {
                    String addressLine = "";

                    for(Integer i = 0; i < addresses.get(0).getMaxAddressLineIndex(); i++)
                    {
                        if(!addressLine.equals(""))
                        {
                            addressLine+= ", ";
                        }

                        addressLine+=  addresses.get(0).getAddressLine(i);
                    }

                    if(addressLine!="")
                    {
                        foundAddress+= addressLine;
                    }


                }


                }
                catch (Exception e) {
                    // TODO: handle exception

                }
                finally
                {

                }



                return foundAddress;
            }

            @Override
            protected void onPostExecute(String result)
            {
                this.dialog.cancel();
                showToast(result);

            }
        }



      public void showToast(String message)
        {
            Context context = getApplicationContext();
            String toasttext = message;
            int duration = Toast.LENGTH_SHORT;

            Toast toast = Toast.makeText(context, toasttext, duration);
            toast.show();
        }

}

在清单文件中使用以下权限

 <uses-permission android:name="android.permission.INTERNET" /> 
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
         <uses-library android:name="com.google.android.maps" />
        <activity
            android:label="@string/app_name"
            android:name=".DragAndDropPinActivity" >

        </activity>


            <activity
            android:label="@string/app_name"
            android:name=".rescue" >
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>